Internal-combustion engine.



A. V. WALDO. INTERNAL COMBUSTION ENGINE. APPLICATION FILED JUNE 13, 1912.

1,078,392. Patented Nov. 11,1913.

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APPLICATION FILED JUNE 13,1912.

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ALBERT V. WALDO, F DEGRAFF, OHIO.

INTERNAL-COMBUSTION ENGINE.

I Specification of Letters Patent. 4 Application filed June 13, 1912. Serial No. 703,5$2.

Patented Nov. 11,1913.

To all whom it may concern:

Be it known that I, ALBERT V. WALDO, a

. citizen of the United States, resident otDeinvention, reference being had'to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

Figure 1 is a section on the line 11, Fig.

' 3. Fig. 2 is a section on the line 2-2, Fig.

1. Fig. 3 is a section on the line 3-3, Fig. 1.

The invention has relation to internal combustion engines, and it consists in the novel construction and combinations of parts, as hereinafter set'forth. 1

In the accompanying drawings 'illustrat ing, the invention, the numeral 1, designates one of the four cylinders of the engine; 2,

the piston working therein; 3, 3' lateral piston valve chambers, 4, 4 piston valves working in said chambers; 5, a water jacket lining for the cylinder and chambers, and 6, 6 valve ports from the chambers to the cylinder.

As usual with four-cycle engines, to which my invention relates, the piston has a stroke in one direction for charg1ng,a stroke-in the opposite direction to cornplfess the charge, a stroke under the impulse" of the "exploded charge for driving and a stroke back again to exhaust the charge, the pistons of the four cylinders, (only one of which is shown) being arranged to act successively upon the crank 'shaft to drive it.

The piston valves are'operated in any suitable manner preferably by means of a train of gears 7, 7, cranks 8, 8i, and connecting rods 9, 9 from the cranked shaft 10, of the end gear of the train; the crank shaft 11,

having a connecting rod 12, with the piston, and carrying the other end gear of the train of gears. In the operation of the engine the train of gears will move the piston valves to expose the inlet port 6 upon the charging stroke only of the piston, and to expose the exhaust port 6, upon the exhaust stroke only of the piston, these ports being closed upon the other strokes.

Eachpiston. valve is provided with -packing; rings 13, and in order that the material of these rings may not be liable to expand through the valve ports 6, 6', it is preferred to provide these ports with intermediate oblique cross bars 14, 14'.

In'the operation of the engine, the explo-' sive mixture is admitted to the chamber 3 ,at 16, being drawn thereinto by movement of the piston valve, starting from substantial contact with the top of said chamber and when the valvejport 6 is exposed,'this mi ture is drawn into the cylinder, .the pis n of which is upon its charging stroke. Af- 1 terthe charge has been-drawn into the cylinder, the valve port is closed by the piston valve, and the piston is operated reversely to .compress the charge, which is exploded by the igniting or sparking device 17 at the proper time. The piston is now driven back by the impulse of the charge, and the fourth stroke of the piston, completing the cycle, acts to expel the exhausted gases through the port 6', which is opened by movement of the piston valve 4'. At the end of the exhaust stroke of the working piston the piston valve 4, now upon its upstroke, will have closed port 6, and, continuing to the top of the exhaust chamber 3' into substantial contact therewith, will force the exhausted gas out through the exhaust port, communicating with the chamber through the end wall thereof.

The piston valve chambers or cylinders 3, 3', are arranged with their axes at an angle to the axis of the workin cylinder, to overhang the same, so that the castings may be made more compact and the ports made as short as possible, the ports'being measured in length at the center by the thickness of the cylinder wall; while providing for. ample water-jacketin and for a location of the valve chambers.

My invention is designed to increase the efficiency of the engine, to render the opera:

'tion of the valves more reliable, and repairs more easily made.

Having thus described my invention,\vl1at' I' claimasnew and desire to secure by Letters Patent is 1.-In an internal combustion engine, a cylinder, a working piston therein, inlet and exhaust chambers having intermediately of their length lateral ports communicating with said cylinder, inlet and exhaust ports in the end walls of said chambers, piston valves working in said chambers, means for too a operating one of said valves to draw the explosive mixture into the inlet chamber, to

uncover the lateral port thereof upon the charging stroke of the working piston and to close said port upon the other strokes thereof, and means for operating the other of said valves to uncover the lateral port of the exhaust chamber upon the exhaust stroke of the working piston, to close said port during the other strokes of said piston and to clear the exhaust chamber of the burnt gases, said valves having respectively at one end substantial contact with the entire end walls of said chambers at the beginning of the intake and end of the exhaust stroke.

2. In an internal combustion engine, a working cylinder, a piston therein, cylindrical inlet and exhaust chambers axially inclined with relation L0 and having a water jacket space between the same and said working cylinder, said chambers having intermediately of their length short lateral ports measured at the center in length by the thickness of the cylinder wall and communicat ng with the upper portion of said cylinder, inlet and exhaust ports in the end walls" of said chambers, piston valves in said chambers, means for operating one of [said valves to draw the explosive mixture into the inlet chamber, to uncover the lateral port thereof upon the charging stroke of the working piston and to close said port upon the other strokes thereof, and means for operating the-other of said valves to uncover the lateral port of the exhaust chamber upon the exhaust stroke of the working piston, to close said port upon the other strokes of said piston and to clear the exhaust chamber of the burnt gases, said valves having respectively at one end substantial contact with the entire end walls of said chambers at the beginning of the intake and end of the exhaust strokes.

In testimony whereof I affix my signature, in presence 'of two witnesses.

ALBERT v. WALDO.

llVitnesses W. L. BUMGARDNER,

' CHARLES CRETCHER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. G. 

